How to fix mountain washout

[Topzide]

Another thing to use to keep water off the trail. Get some used guard rail and lay in trail at angle to catch and shed water off trail. You can use to bolt holes to help anchor it in place. Have seen it used on a few hills with great success! If set right, you can push snow over them without catching them. Just another idea to throw out there.
With how far you can reach, might you be able to anchor in a cage to hold?

 

[LouNY]

You will need a larger backhoe excavator with more reach. That is the problem with the little ones they don't have much reach.
Reach out n down trench in and flat or even a bit of slope into the mountain and the mentioned gabion cages.
Even if you start out short and narrow then step it up a bit taller and wider and stair step up to or a bit above your desired level.

 

[airbiscuit]

The previous owner told me a guy with a small dozer was able to cut the trail in. I was also amazed because I'm not sure how he got a dozer through many of these rock sections. I've started on the water bars now, I like the bed mat idea as well.

Just toss in some rocks the same size as the cajones on that (small) dozer operator who cut that trail in.

 

[Jrasband]

Still doesn't look that steep to me that you can't make a flat spot to put a cage in. It seems you can get your tractor closer to the uphill side so you can get your outrigger down. Also, You don't even need to use your tractor to make a flat spot, if it is not rocky there it won't take you long to make a flat spot with a mattock.